It's nice that you keep antivirus full of features and nice interface,but you're forgeting about most important things. I have sent several samples and they still haven't been added.
Rare updates through week (2 updates are really not enough IMO),small number of added files(connected with rare updates). No malware isn't that non-importnat that it shouldn't be added. AntiVir has definitions 2,4MB in size and they update them every day. With your incrimental update system daily updates shouldn't be a problem.
I have also seen AVG scoring better than avast! lately. Thats not a good sign trust me.
I'm really dissapointed with what i see for the last few weeks and i good for you i hope you will reconsider my words and fix this ASAP.